vacuum tube

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vac·uum tube

a glass tube from which the air has been removed, containing two or more electrodes, between which passes an electrical current or spark; used in the production of x-rays, or to control circuits. Previously in wide use, the vacuum tube has been supplanted by transistors in electronic circuits.
Farlex Partner Medical Dictionary © Farlex 2012

vacuum tube

A vessel of insulating material (usually glass) that is sealed and has a vacuum sufficiently high to permit the free flow of electrons between the electrodes that extend into the tube from the outside. In England, it is called a vacuum valve.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Bosch, the world's largest spare parts supplier, will help the Iranian company produce oxygen sensors, electrical accelerators, electrical valves and engine control units (ECU), it said.
Other items that Akhtar unlawfully procured or exported, or attempted to procure or export, to restricted entities in Pakistan include mechanical and electrical valves, cranes and scissor lifts, the Justice Department said, noting that the total worth of all of these items exceeds 400,000 dollars.

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